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Junit is a unit testing framework for Java, whereas Unit Test Assistant (UTA) in Jtest 10.x is a tool which is used to build, improve, and analyze Junit tests. Jtest does not compete with or replace Junit; it helps you build and maintain Junit tests.
It is possible to use database inputs to Junit tests, although this is not a standard feature of Junit. You would need a library or API, like JDBC, to access the database for the data you need.